FolioVision

There’s one problem with Gravatars. They are very slow to load. Each page with comments on them makes one call per comment to the Gravatar server. While a single call takes only a 100ms, on a page with hundreds of comments, we are talking about major slowdowns. Page loads can take 20 seconds and more.
This plugin solves this problem by:
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caching gravatars with WordPress cron job..
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caching gravatars on comment submission
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maintaining a single copy of the default gravatar instead of downloading it again and again for all the email addresses with no gravatar associtated
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<a href="http://foliovision.com/seo-tools/wordpress/plugins/fv-gravatar-cache/installation" rel="nofollow ugc">Installation guide</a>
<a href="http://foliovision.com/seo-tools/wordpress/plugins/fv-gravatar-cache" rel="nofollow ugc">Support and more information</a>

FV Gravatar Cache

I deactivated plugin but still contains elements in Database

Database Junk

Speeds up your website by making sure the gravatars are stored on your website and not loading from the gravatar server.

Jason Coleman

Paid Memberships Pro

Jared Atchison

<h4>Add an avatar upload field on frontend pages and Edit Profile screen so users can add a custom profile picture.</h4>
Community and Membership sites on WordPress use this plugin as a lightweight solution for custom user avatars. The plugin is compatible with bbPress, as well as many popular plugins with frontend user registration and profile management features.
Admins can upload a user’s avatar on the Edit User admin screen.
Basic User Avatars also supports front-end avatar management for sites that want to keep users out of the dashboard. To use this feature, add the shortcode <code>[basic-user-avatars]</code> to any page in your WordPress site. We recommended placing this shortcode on another logged-in account type page, such as the WooCommerce My Account page, the Membership Account page, or any other front-end profile edit form.
The Avatar Upload form is automatically added to the bbPress User Profile > Edit frontend page.
If you do not want your users to be able to update their avatar, navigate to Settings > Discussion and locate the “Local Avatar Permissions” setting. Check this box to only allow users with file upload capabilities to upload local avatars (Author role and above).
<h4>Seamlessly Migrate from WP User Avatar Plugin</h4>
Version 1.0.5 includes a feature to automatically convert avatars formerly loaded through the WP User Avatar plugin. This means that you can disable WP User Avatar, activate Basic User Avatars, and have a seamless transition for existing avatars in your site. Be sure to update any avatar upload form that used the <code>[avatar_upload]</code> shortcode to use the shortcode: <code>[basic-user-avatars]</code>.

Basic User Avatars

it may have been around for a while but this plugin still works well

still works with WP4.9.1

Add an avatar upload field on frontend pages and Edit Profile screen so users can add a custom profile picture.

FV Gravatar Cache vs Basic User Avatars